The canopy can open at the top and might just put two big fans in to extract the heat. that should work right ?

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Alternative is to use a jigsaw and cut a slot above the LED units.

ow far would the LED unit lenses be from the water.

Radion should be mounted if not mistaken between 22 and 27cm. That is to prevent water splashes and excessive moisture from damaging the units. If too close, maybe mount the units above the canopy and the slot.